Bob has 56 stamps and Tom has 80 stamps if bob collects 12 per week and Tom collects 8 per week when will they be the same

Question

when will they have the same number of stamps 

Answer 1

Let x = the number of weeks

Bob: y = 56 + 12x

Tom: y = 80 + 8x

56 + 12x = 80 + 8x

4x = 24

x = 6 weeks